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Finding the Fourth Proportional to 131.80, 181.81 and 104.13

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Solution

The fourth proportional to 131.80, 181.81 and 104.13 is: 143.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.80 : 181.81 = 104.13 : x
  2. Step 2: Convert to fraction form
    131.80/181.81 = 104.13/x
  3. Step 3: Cross multiply
    131.80x = 181.81 × 104.13
  4. Step 4: Simplify right side
    131.80x = 18,931.88
  5. Step 5: Solve for x
    x = 18,931.88/131.80
  6. Step 6: Final answer
    x = 143.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.